/**
 * editor_plugin_src.js
 *
 * Copyright 2009, Moxiecode Systems AB
 * Released under LGPL License.
 *
 * License: http://tinymce.moxiecode.com/license
 * Contributing: http://tinymce.moxiecode.com/contributing
 */

(function() {
    var DOM = tinymce.DOM, Event = tinymce.dom.Event, each = tinymce.each, explode = tinymce.explode;

    tinymce.create('tinymce.plugins.TabFocusPlugin', {
        init : function(ed, url) {
            function tabCancel(ed, e) {
                if (e.keyCode === 9)
                    return Event.cancel(e);
            }

            function tabHandler(ed, e) {
                var x, i, f, el, v;

                function find(d) {
                    el = DOM.select(':input:enabled,*[tabindex]');

                    function canSelectRecursive(e) {
                        return e.nodeName==="BODY" || (e.type != 'hidden' &&
                            !(e.style.display == "none") &&
                            !(e.style.visibility == "hidden") && canSelectRecursive(e.parentNode));
                    }
                    function canSelectInOldIe(el) {
                        return el.attributes["tabIndex"].specified || el.nodeName == "INPUT" || el.nodeName == "TEXTAREA";
                    }
                    function isOldIe() {
                        return tinymce.isIE6 || tinymce.isIE7;
                    }
                    function canSelect(el) {
                        return ((!isOldIe() || canSelectInOldIe(el))) && el.getAttribute("tabindex") != '-1' && canSelectRecursive(el);
                    }

                    each(el, function(e, i) {
                        if (e.id == ed.id) {
                            x = i;
                            return false;
                        }
                    });
                    if (d > 0) {
                        for (i = x + 1; i < el.length; i++) {
                            if (canSelect(el[i]))
                                return el[i];
                        }
                    } else {
                        for (i = x - 1; i >= 0; i--) {
                            if (canSelect(el[i]))
                                return el[i];
                        }
                    }

                    return null;
                }

                if (e.keyCode === 9) {
                    v = explode(ed.getParam('tab_focus', ed.getParam('tabfocus_elements', ':prev,:next')));

                    if (v.length == 1) {
                        v[1] = v[0];
                        v[0] = ':prev';
                    }

                    // Find element to focus
                    if (e.shiftKey) {
                        if (v[0] == ':prev')
                            el = find(-1);
                        else
                            el = DOM.get(v[0]);
                    } else {
                        if (v[1] == ':next')
                            el = find(1);
                        else
                            el = DOM.get(v[1]);
                    }

                    if (el) {
                        if (el.id && (ed = tinymce.get(el.id || el.name)))
                            ed.focus();
                        else
                            window.setTimeout(function() {
                                if (!tinymce.isWebKit)
                                    window.focus();
                                el.focus();
                            }, 10);

                        return Event.cancel(e);
                    }
                }
            }

            ed.onKeyUp.add(tabCancel);

            if (tinymce.isGecko) {
                ed.onKeyPress.add(tabHandler);
                ed.onKeyDown.add(tabCancel);
            } else
                ed.onKeyDown.add(tabHandler);

        },

        getInfo : function() {
            return {
                longname : 'Tabfocus',
                author : 'Moxiecode Systems AB',
                authorurl : 'http://tinymce.moxiecode.com',
                infourl : 'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/tabfocus',
                version : tinymce.majorVersion + "." + tinymce.minorVersion
            };
        }
    });

    // Register plugin
    tinymce.PluginManager.add('tabfocus', tinymce.plugins.TabFocusPlugin);
})();
